For the past several months, when I put the key in the ignition...sometimes it turns over and starts and sometimes it does nothing. All the lights go on, radio works, etc...but turning the key does nothing. If I wait 5 mins and keep trying...it eventually turns over like nothing is wrong. No reason, no pattern...just doesn't start when it feels like it. What kind of ignition problem is it?? I took it to the local dealship in Tamarac,FL and they changed the battery, then gave up on it because it didn't NOT START again for them. Said I had to just live with it because it is a Lumina. Help !!